code: def setUpClass(cls) -> None:
      ray.init(num_gpus=1)
  
file_path: ray/rllib/algorithms/appo/tests/test_appo_off_policyness.py
imports: import unittest
  import ray
  import ray.rllib.algorithms.appo
  from ray.rllib.utils.framework import try_import_tf
  from ray.rllib.utils.test_utils import check_compute_single_action, check_off_policyness, framework_iterator
label_desc: Use image node_id 1 for calling the TestAPPOOffPolicyNess obj's underlying member method code with example usage: obj.setUpClass(cls) without return types